There should be events like this even if it is a waste of time ... I do think if he has murdered her without leaving much forensic evidence the chances of him dropping her behind the house in the valley are slim to none for a few reasons. Firstly, the car access is poor to a lot of it, the easily accessed parts would have been her found already, and you are probably running a great risk being seen even late at night because it is a well populated area. Jill Meagher was driven up the calder fwy to Diggers Rest (!!), the little Indian boy who was killed by the housemate with the door (!?) was driven and dumped in the grassland around the airport in Oaklands Junction from Lalor, GBC went from Brookfield to the Kholo Creek bridge- look up those distances, they are all about the 20-30 minutes and km distance ... If Borce has done this and disposed of her, she will be found half an hour up the Calder hwy somewhere IMO - not on the highway per se, but concealed on a back road or in crown land. It is places they are somewhat familiar with but feels far enough away, and it can be done in under 2 hours, an easy time frame to explain away.